Machine for making spaced coiled filaments



NOV. 4, 1930. s, w s 1,780,609

MACHINE FOR MAKING SPACED COILED FILAMENTS Filed July 26, 1928 sSheets-Sheet, 1'

ATTORN EY Nov. 4, 1930. s W EN i 1,780,609

MACHINE FOR MAKING SPACED COILED EILAMENTS Filed July 26, 1928 j 3Sheets-Sheet, 2

Illiii HIHIQIII'HH HM ll INVENTOR STE/v 1M4 0s TEN ATTORNEY NOV. 4,1930. 5\[w 5 1,780,609

MACHINE FOR MAK NG SPACED COILED FILAMENTS Filed Jiily 26, 1928 3Sheets-Sheet, 5

INVENTOR Y STEN WAD TEN ATTOR E Patented Nov. 4', 1930 (UNI EDfQsTATEsPATENT OFFICE sa nt:lwnnsrnngjonfnnoomrrnnn; NEW JERSEY, assrsnon ToWEST NGHOUSE LAMP company, aconronarion or PENNSYLVANIA MIAGII-IINE FORMAKING srAcEnooILEn FILAMENTS jApplication filed Ju1y'26,

electric lamps, to produce-the coiled body in? the absence of a-mandrel.A coiled body such: as a light source or lamp filament when producedWltllOllt the aid of a mandrelmay be 1 manufactured at a? lower cost andhigher speed inasmuchas the operationof re1noving the mandrel iseliminated; v A machine for producing a coiled filament body, astor instance a lamp filament,is shown anddescribed .29 in Patent 1,670399. Theabovementioned copendingapplication, however, shows animproved form ofcoil Windingdiewhichmay be used in connection With the inachinedisclosed inthesaid patent. 5 I V The coil Winding die, as set forth in thesaid copending application, isproduced by. providing a coiled Wirehelically WOIlIlCl'llPOIl a mandrel and With the turns of the coil incontactingrelation so as to make What is termed 8 a closed coil. Thiscoil is used as a primary embossing rn'atrixandiis suitably supported sothat a pair of dieblanks,in the form of discs of relatively softmet'al,may be disposed With their edges or peripheries in contact with 7:35opposite sides ofthe coil. The blanks may then be rotated in thepresence of sufficient force, to compress them'upon the embossing matrixduring a rollingmovement of the blanks over the-matrix, Which movementmay tained in the blanks," i

Another or second embossing matrix may thenbe provided by Winding a wireupon a mandrel with the spaced'relation of the turns T49 continue untilan initialdepressionis ob- .1 of the coil of a predetermined degree orpitch f in accordance with the desired pitch to be ob tained in the die1 produced. and consequently in the coilproduced by means of the. die.Blanks vvith'the initial'depression therein I may then be rolled overthesecond embossing 192s. Serial'No. 295,536.

matrix in the presence of suflicient force to compress the blanks withan impression of the properlyspaced coil. The blanks maythen beh'ardenedand employed as coil Winding elements or dies in amandrellesscoil Winding machine. y

In the manufacture of certain types of incandescent electric lamps, thelight source or filament therefor is formed from a highly refractoryWire such as tungsten, coiled to helical form. Certain types offilaments are w ound in continuous helixes and severed to given lengths,each lengthbeing of such dimensions as to have the required resistancefor a given type lamp. Filaments of this char- 'acter are usuallysecured to the leading-in conductors of the lamp by clamping or Weldingdirectly to the coiled end of the sections.

When securing a completely coiled section to y a leading-in Wire,certain disadvantages arise in that the clamping or Welding operationmay include more or less of the coiled sections thus changing the.effective filament length 1 and consequently changing'the resistance ofthe element to the end that the desired rating of the filament isaltered. It 1s desirable, therefore, in certain cases, to produce acoiled section hav ng straight portions as terminals so that the Weldingor clamping operation for securing the ends of thecoiled section tothelead-in Wire is facilitated. When straight ends are provid ed asterminals for a filament, the weldingor clampingoperation, tosecure thefilament to leading-in conductors, may be accomplished in a more uniformmanner, thus mak-:' ing the mounting operation more accurate.

I-Iereto'fore, filament Wire hasbeen Wound to helical form so as toproduce a seriesof sections elf-closely ound turns of Wire separated .byone or more turns of-greater pitch than the turns composingthe closelyWound sections, thus providing. relatively closely Wound sections ofWire terminating in uncoiled or comparatively straight portions. Theabove operation,fhowever, has previously been performed on What is knownas a mandrel Wound coil inding machine and the spacing of the coils wasaccomplished by changing the relative movement of the mandrel and thedegree of rate of winding.

It is an object of the present invention to ,rovide means for en ortinand mani ulating the above described coil winding die so as to produceaplurality of coiled sections of a given pitch separated by sections ofa different or greater pitch.

Another object of the invention is to provide a machine forautomatically winding coiled sections separated by uncoiled portions ofwire. 7

Other objects and advantages of the invention will be more fullyunderstood from the following description, together with theaccompanying drawing, in which:

Figure 1 is a plan view of a portion of a coil winding machine showingthe present coil winding die in operative relation thereto;

Figure 2 is a side view the mechanism shown in Figure 1;

Figure 3 shows a modified form of means for holding the die to producespaced coils in accordance with the present invention;

Figure 4 is a side view of the oie and support shown in Figure 3;

Figure 5 is a top view of the port shown in Figure 3 Figure 6 is anenlarged view of a coil winding die in position to receive the wire fromthe driving roller; v

Figure 7 is a fragmentary view of the die shown in Figure 6 andillustrates different relative positions between the die and'the drivingrollers; and

Figure 8 is a fragmentary side view of the die and supdie in positionadjacent tothe driving rollers.-

. Although the present form of coil winding die may be associated ithvarious types of mechanismfor driving a wire, it isshown and describedin connection with a coil winding machine ofthe character disclosed inthe above mentioned patent, in which a pair of driving rollers 10 and 11are provided to drive a wire 12 which may be received from a spool orany other suitable source not shown. The rollers 10 and 11 are rotatedat high speed by suitable means, not shown, in the present drawing. Theroller 10 is mountedin aplate 13 hinged at 14 in bearings 15 and 16 andthe roller 11 is journaled in the frame of the machine. T he rollers 10and 11 are provided with circumferential grooves 10 and 11,

each havin a denth sli htl 7 less than the diameter of the wire so as tofrictionally engage the same when the plate 13 is inposition to disposethe roller 10 adjacent to the roller 11.

A rotation of the rollers 10 and 11 causes a movement of the wire 12toward a die 17 more clearly shown in Figures 6 to 8, so that the wireengages with a groove 18 and issues from the die'in the form of a coil19. When the driving rollers are continuously operated to drive the wireinto the die, a continuous helix is produced.

For the purpose of intermittently terminating the coiling operation,means are provided for changing the relative posit-ion of the die andthe rollers at intervals. This means may comprise a plunger 20 slidableo in a bearing 21. The die may be mounted on a pin22 at an upper end 23ofthe plunger and maybe provided with aratchet wheel 24 engageable withdogs 25 and 26 pivoted on the bearing 21. Thevratchet mechanism isprovided so that the die will be normally held in a given position andby means of an adjustment of the dogs the die may be rotated to positionanew groove for a coil winding operation. The bearing'21 is mounted on abracket 27 pivotally connected at 28 to a shaft 29 loosely fitted in abearing 30. The bracket 27 is provided with an extension 31 having anarm 32 provided with a split collar 33 surrounding the plunger 20 toprovidea guide bearing.

The lower end 34 of the plunger 20 is pro vided with a swivel connection35 having an arm 36 pivotally connected to one end of a lever 37 pivotedat 37, the opposite end of the lever being pivotally connected to an end38 of a push rod 39. Thispush rod may be supported in bearings 40 and 41and is providedwith a beveled lifter plate 42, an end of which isdisposed beneath a projection 43 integral with the plate 13 so that amovement of the'lifter' plate 42 results in slightly elevating the plate13, thus lifting the roller 10 from engagement with the wire 12 andterminating the movement of the wire toward the guide, t

The lifter plate 42 is provided with a slot 44 through which a pin 45extends, the plate 42 being slidable along the push rod and adjustableby means of a set screw 46. Thus the lifter plate may be adjusted so asto lift the roller 10 exactly the :proper amount to release the wirewithout permittingthe wire to escape from between the grooves 10 and 11.

The mechanism for causing a movement of the lifter plate may comprisethe cam 47 mounted on a shaft 48 and rotated in timed relation to theother mechanism by suitable connection, not shown. The cam 47 engages anabutment 49 secured to the push rod 39, a spring 50 serving-to normallymaintain the abutment in contact with the cam. Thus a rotation of theshaft 48 will cause the push rodto move in the direction of the arrow X,thereby moving the plunger 20 downwardly carrying the die away from therollers.

After a section'of, wire has been wound con taining the proper number ofturns, the cam operates causing the push rod to function to remove thedie a predetermined distance from the driving rollers. When the die hasreached its lower position, the lifter plate operates to terminate themovement'of the wire and a continued rotation of the cam will permit thespring to bring the die back to its coil winding position and the lifterplate will cause the roller 10 to engage with the wire and the coilwinding operation will be continued. It has been found that after aseries of coils are woundand the coil winding operation is interruptedintermittently at given intervals by reason of theformation of the cam aplurality of coiled sections are produced, separated by sections ofsubstantially straight wire or wire having a coil of an extremely largepitch.

It will be noted that when the lever 37 is'oscillated to causeareciprocal movement of the push rod, a slight rocking action isimparted to'the die 17 since thesupporting structure for the die ismovable on shaft 29 in bearing 30. This rocking or sidewise move-' mentof the die tends to dislodge a coiled section or slightly bend the wireadjacent to the said section so that after the die has been lowered andthen returned to its operating position the starting of a new sectionwill be facilitated. After a number of coils have been formed or aftereach coil is made,

mechanism may be provided for cutting the wire intermediate the coiledsections.

The above described mechanism illustrated one means for interrupting thecoil winding movement by a bodily movement of the die.

with respect to the driving rollers. In Figures 31:0 5, however,mechanism is provided wherein a die 17 is mounted on a spindle 51carried at one end of a bracket plate 52. Secured to the die is a rigidWheel 53 and adj acent to the rigid wheel and pivotally connected to thespindle 51 is a rocker arm 54.

A dog 55 is pivotally mounted on the rocker arm at 56 and held incontact with the teeth of the ratchet wheel 53 by a spring 57. Anoscillation of the rocker arm 54 operates to cause an intermediaterotary movement of the die. Mechanism for rocking the arm 54 maycomprise a cam 58 mounted on a shaft 59 driven through any suitablesource of power, not shown. The cam 59 is engageable with a lug 60 onthe arm 54 and a spring '61 normally maintains the lug contact with thecam. The arm 54 s provided wlth an extension 62 having a guide slot 63to re-.

ceive a pin 64 extending from the bracket 52.

In operation the driving rollers 10 and 1 1 propel the wire 12 into agroove in the die 17 and after a predetermined number of coils havebeenwound the cam member 58 permlts the spring 61 to act causing thelifter mechanism to move the die in the direction of the arrow Y, thuscausing the coiled sections to move away from thepath of movement of thestraight wire which continues to move into the die to produce anothercoiled section. It has been found that coiled sections separated byuncoiled sections or substantially straight portions, can be produced bya sudden displacement of the coil winding die and if this displacementoccurs as in accordance with the present invention at pre determinedintervals, a series of coiled sections will be produced separated bysubstantially straight portions. It is who understood that the number ofcoils in a section maybe varied and that the cam 58 may be changedorthat the movement or stroke of isto be'understood that modifications maybe made therein without departing from the spirit and scope oftheappended claims.

Whatis claimed is:

' 1. A coil Windingv machine comprising means formoving a wire,mandrelless coil winding means and means for intermittently terminatingthe coiling operation to'produce uncoiled portions ofwireconnectingcoiled portions;

2. A. coil winding machine comprising meansfor moving a wire, a coilwinding .die

and means for intermittently causing a change in the relative positionsof said means and die to. produce uncoiled portions of wire connectingcoiled portions.

30A machine of the class given path,a wire coiling die in the path ofmovement of said wire tov produce a coiled section and means for causinga movement of said die to interrupt the coiling operation.

given path, a wire coiling die disposed to receive and coil said wireand means for changing the relative positions of said first coiledsections separated by uncoiled portions of wire.

5. A machine of the class described comprising means for driving a Wirethrough a given path, wire coiling means and means for causing amovement of said wire coiling means away from said wire driving means,means forterminating the movement of said wire, and means for movingsaid wire coiling means toward said wire driving means.

described comprising means for movmg a wire through a g '4. A- machineofthe class described comprising. means for moving a wire through a Intestimony whereof, I have hereunto subscribed my name this 25th dayof'July, 1928.

i srnn wAns'rEN. i

n5 mentioned means and said die to produce

